I haven't read as much on this as I'd like, but a relevant and fairly brief source is Friendly Feudalism - The Tibet Myth by Michael Parenti. It makes the case that Tibet (which was under the control of the last Imperial Chinese dynasty from about 1720-1912) still had many of the hallmarks of a feudal society by the time the PRC annexed it in 1950. There were various forms of serfdom (or at least a serf-like class of laborers), chattel slavery, and disfiguring corporal punishment. If one remote part of formerly-Imperial China was still effectively feudal even in 1950, I think it's likely that other parts may have been pretty close to feudal, too, and that matches what I've read in other places (but can't put my hands on now). It certainly seems like there's a big gap between how landlords operated in ~1950 rural China and the "guy who owns your modern apartment building but still (kind of) has to operate in a modern legal framework, complete with tenant protections and meaningful criminal law enforcement" framework people think of when they hear the term "landlord" in a 2020 American context.